readdir - node.js readdir sample

readdir.js

var fs = require('fs');
fs.readdir( process.argv[2], function (err, files) { 
	if (!err) 
		console.log(files);
	else
		throw err; 
});
console.log("Fired callback.");

var fs = require('fs');
fs.readdir( process.argv[2], function (err, files) {
if (err) {
throw err;
}
console.log(files);
});
console.log("Fired callback.");

by checking for the error first it keeps the reader from looking up and back down when scanning your code, and by catching the error in the IF first, you don't have to write ELSE